[PATCH] i2c: Driver to expose PowerNV platform i2c busses

@@ -154,6 +154,7 @@ struct opal_sg_list {
 #define OPAL_HANDLE_HMI				98
 #define OPAL_REGISTER_DUMP_REGION		101
 #define OPAL_UNREGISTER_DUMP_REGION		102
+#define OPAL_I2C_REQUEST			109
 
 #ifndef __ASSEMBLY__
 

@@ -801,6 +802,24 @@ typedef struct oppanel_line {
 	uint64_t 	line_len;
 } oppanel_line_t;
 
+/* OPAL I2C request */
+struct opal_i2c_request {
+	uint8_t	type;
+#define OPAL_I2C_RAW_READ	0
+#define OPAL_I2C_RAW_WRITE	1
+#define OPAL_I2C_SM_READ	2
+#define OPAL_I2C_SM_WRITE	3
+	uint8_t flags;
+#define OPAL_I2C_ADDR_10	0x01	/* Not supported yet */
+	uint8_t	subaddr_sz;		/* Max 4 */
+	uint8_t reserved;
+	__be16 addr;			/* 7 or 10 bit address */
+	__be16 reserved2;
+	__be32 subaddr;		/* Sub-address if any */
+	__be32 size;			/* Data size */
+	__be64 buffer_ra;		/* Buffer real address */
+};
+
 /* /sys/firmware/opal */
 extern struct kobject *opal_kobj;
 

@@ -963,6 +982,8 @@ int64_t opal_handle_hmi(void);
 int64_t opal_register_dump_region(uint32_t id, uint64_t start, uint64_t end);
 int64_t opal_unregister_dump_region(uint32_t id);
 int64_t opal_pci_set_phb_cxl_mode(uint64_t phb_id, uint64_t mode, uint64_t pe_number);
+int64_t opal_i2c_request(uint64_t async_token, uint32_t bus_id,
+			 struct opal_i2c_request *oreq);
 
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,

@@ -250,3 +250,4 @@ OPAL_CALL(opal_handle_hmi,			OPAL_HANDLE_HMI);
 OPAL_CALL(opal_register_dump_region,		OPAL_REGISTER_DUMP_REGION);
 OPAL_CALL(opal_unregister_dump_region,		OPAL_UNREGISTER_DUMP_REGION);
 OPAL_CALL(opal_pci_set_phb_cxl_mode,		OPAL_PCI_SET_PHB_CXL_MODE);
+OPAL_CALL(opal_i2c_request,			OPAL_I2C_REQUEST);

@@ -644,17 +644,10 @@ static void __init opal_dump_region_init(void)
 		pr_warn("DUMP: Failed to register kernel log buffer. "
 			"rc = %d\n", rc);
 }
-static int __init opal_init(void)
+
+static void opal_console_create_devs(void)
 {
 	struct device_node *np, *consoles;
-	const __be32 *irqs;
-	int rc, i, irqlen;
-
-	opal_node = of_find_node_by_path("/ibm,opal");
-	if (!opal_node) {
-		pr_warn("opal: Node not found\n");
-		return -ENODEV;
-	}
 
 	/* Register OPAL consoles if any ports */
 	if (firmware_has_feature(FW_FEATURE_OPALv2))

@@ -670,6 +663,21 @@ static int __init opal_init(void)
 		of_node_put(consoles);
 	}
 
+}
+
+static void opal_i2c_create_devs(void)
+{
+	struct device_node *np;
+
+	for_each_compatible_node(np, NULL, "ibm,power8-i2c-port")
+		of_platform_device_create(np, NULL, NULL);
+}
+
+static void opal_request_interrupts(void)
+{
+	const __be32 *irqs;
+	int rc, i, irqlen;
+
 	/* Find all OPAL interrupts and request them */
 	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
 	pr_debug("opal: Found %d interrupts reserved for OPAL\n",

@@ -689,6 +697,26 @@ static int __init opal_init(void)
 				   " (0x%x)\n", rc, irq, hwirq);
 		opal_irqs[i] = irq;
 	}
+}
+
+static int __init opal_init(void)
+{
+	int rc;
+
+	opal_node = of_find_node_by_path("/ibm,opal");
+	if (!opal_node) {
+		pr_warn("opal: Node not found\n");
+		return -ENODEV;
+	}
+
+	/* Create console platform devices */
+	opal_console_create_devs();
+
+	/* Create i2c platform devices */
+	opal_i2c_create_devs();
+
+	/* Register OPAL interrupts */
+	opal_request_interrupts();
 
 	/* Create "opal" kobject under /sys/firmware */
 	rc = opal_sysfs_init();

@@ -805,3 +833,5 @@ void opal_free_sg_list(struct opal_sg_list *sg)
 			sg = NULL;
 	}
 }
+
+EXPORT_SYMBOL_GPL(opal_i2c_request);

@@ -1044,4 +1044,15 @@ config SCx200_ACB
 	  This support is also available as a module.  If so, the module
 	  will be called scx200_acb.
 
+config I2C_OPAL
+	tristate "IBM OPAL I2C driver"
+	depends on PPC_POWERNV
+	default y
+	help
+	  This exposes the PowerNV platform i2c busses to the linux i2c layer,
+	  the driver is based on the OPAL interfaces.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called as i2c-opal.
+
 endmenu

@@ -102,5 +102,6 @@ obj-$(CONFIG_I2C_ELEKTOR)	+= i2c-elektor.o
 obj-$(CONFIG_I2C_PCA_ISA)	+= i2c-pca-isa.o
 obj-$(CONFIG_I2C_SIBYTE)	+= i2c-sibyte.o
 obj-$(CONFIG_SCx200_ACB)	+= scx200_acb.o
+obj-$(CONFIG_I2C_OPAL)		+= i2c-opal.o
 
 ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG

@@ -0,0 +1,276 @@
+/*
+ * IBM OPAL I2C driver
+ * Copyright (C) 2014 IBM
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/mm.h>
+#include <asm/opal.h>
+#include <asm/firmware.h>
+
+static int i2c_opal_send_request(u32 bus_id, struct opal_i2c_request *req)
+{
+	struct opal_msg msg;
+	int token, rc;
+
+	token = opal_async_get_token_interruptible();
+	if (token < 0) {
+		if (token != -ERESTARTSYS)
+			pr_err("Failed to get the async token\n");
+
+		return token;
+	}
+
+	rc = opal_i2c_request(token, bus_id, req);
+	if (rc != OPAL_ASYNC_COMPLETION) {
+		rc = -EIO;
+		goto exit;
+	}
+
+	rc = opal_async_wait_response(token, &msg);
+	if (rc) {
+		rc = -EIO;
+		goto exit;
+	}
+
+	rc = be64_to_cpu(msg.params[1]);
+	if (rc != OPAL_SUCCESS) {
+		rc = -EIO;
+		goto exit;
+	}
+
+exit:
+	opal_async_release_token(token);
+	return rc;
+}
+
+static int i2c_opal_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
+				int num)
+{
+	unsigned long opal_id = (unsigned long)adap->algo_data;
+	struct opal_i2c_request req;
+	int rc, i;
+
+	/* We only support fairly simple combinations here of one
+	 * or two messages
+	 */
+	memset(&req, 0, sizeof(req));
+	switch (num) {
+	case 0:
+		return 0;
+	case 1:
+		req.type = (msgs[0].flags & I2C_M_RD) ?
+			OPAL_I2C_RAW_READ : OPAL_I2C_RAW_WRITE;
+		req.addr = cpu_to_be16(msgs[0].addr);
+		req.size = cpu_to_be32(msgs[0].len);
+		req.buffer_ra = cpu_to_be64(__pa(msgs[0].buf));
+		break;
+	case 2:
+		/* For two messages, we basically support only simple
+		 * smbus transactions of a write plus a read. We might
+		 * want to allow also two writes but we'd have to bounce
+		 * the data into a single buffer.
+		 */
+		if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD))
+			return -EIO;
+		if (msgs[0].len > 4)
+			return -EIO;
+		if (msgs[0].addr != msgs[1].addr)
+			return -EIO;
+		req.type = OPAL_I2C_SM_READ;
+		req.addr = cpu_to_be16(msgs[0].addr);
+		req.subaddr_sz = msgs[0].len;
+		for (i = 0; i < msgs[0].len; i++)
+			req.subaddr = (req.subaddr << 8) | msgs[0].buf[i];
+		req.subaddr = cpu_to_be32(req.subaddr);
+		req.size = cpu_to_be32(msgs[1].len);
+		req.buffer_ra = cpu_to_be64(__pa(msgs[1].buf));
+		break;
+	default:
+		return -EIO;
+	}
+
+	rc = i2c_opal_send_request(opal_id, &req);
+	if (rc)
+		return rc;
+
+	return num;
+}
+
+static int i2c_opal_smbus_xfer(struct i2c_adapter *adap, u16 addr,
+			       unsigned short flags, char read_write,
+			       u8 command, int size, union i2c_smbus_data *data)
+{
+	unsigned long opal_id = (unsigned long)adap->algo_data;
+	struct opal_i2c_request req;
+	u8 local[2];
+	int rc;
+
+	memset(&req, 0, sizeof(req));
+
+	req.addr = cpu_to_be16(addr);
+	switch (size) {
+	case I2C_SMBUS_BYTE:
+		req.buffer_ra = cpu_to_be64(__pa(&data->byte));
+		req.size = cpu_to_be32(1);
+		/* Fall through */
+	case I2C_SMBUS_QUICK:
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_RAW_READ : OPAL_I2C_RAW_WRITE;
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		req.buffer_ra = cpu_to_be64(__pa(&data->byte));
+		req.size = cpu_to_be32(1);
+		req.subaddr = cpu_to_be32(command);
+		req.subaddr_sz = 1;
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_SM_READ : OPAL_I2C_SM_WRITE;
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		if (!read_write) {
+			local[0] = data->word & 0xff;
+			local[1] = (data->word >> 8) & 0xff;
+		}
+		req.buffer_ra = cpu_to_be64(__pa(local));
+		req.size = cpu_to_be32(2);
+		req.subaddr = cpu_to_be32(command);
+		req.subaddr_sz = 1;
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_SM_READ : OPAL_I2C_SM_WRITE;
+		break;
+	case I2C_SMBUS_I2C_BLOCK_DATA:
+		req.buffer_ra = cpu_to_be64(__pa(&data->block[1]));
+		req.size = cpu_to_be32(data->block[0]);
+		req.subaddr = cpu_to_be32(command);
+		req.subaddr_sz = 1;
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_SM_READ : OPAL_I2C_SM_WRITE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	rc = i2c_opal_send_request(opal_id, &req);
+	if (!rc && read_write && size == I2C_SMBUS_WORD_DATA) {
+		data->word = ((u16)local[1]) << 8;
+		data->word |= local[0];
+	}
+
+	return rc;
+}
+
+static u32 i2c_opal_func(struct i2c_adapter *adapter)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+	       I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+	       I2C_FUNC_SMBUS_I2C_BLOCK;
+}
+
+static const struct i2c_algorithm i2c_opal_algo = {
+	.master_xfer	= i2c_opal_master_xfer,
+	.smbus_xfer	= i2c_opal_smbus_xfer,
+	.functionality	= i2c_opal_func,
+};
+
+static int i2c_opal_probe(struct platform_device *pdev)
+{
+	struct i2c_adapter	*adapter;
+	const char		*pname;
+	u32			opal_id;
+	int			rc;
+
+	if (!pdev->dev.of_node)
+		return -ENODEV;
+	rc = of_property_read_u32(pdev->dev.of_node, "ibm,opal-id", &opal_id);
+	if (rc) {
+		dev_err(&pdev->dev, "Missing ibm,opal-id property !\n");
+		return -EIO;
+	}
+	adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
+	if (!adapter)
+		return -ENOMEM;
+	adapter->algo = &i2c_opal_algo;
+	adapter->algo_data = (void *)(unsigned long)opal_id;
+	adapter->dev.parent = &pdev->dev;
+	adapter->dev.of_node = of_node_get(pdev->dev.of_node);
+	pname = of_get_property(pdev->dev.of_node, "port-name", NULL);
+	if (pname)
+		strlcpy(adapter->name, pname, sizeof(adapter->name));
+	else
+		strlcpy(adapter->name, "opal", sizeof(adapter->name));
+
+	platform_set_drvdata(pdev, adapter);
+	rc = i2c_add_adapter(adapter);
+	if (rc)
+		dev_err(&pdev->dev, "Failed to register the i2c adapter\n");
+
+	return rc;
+}
+
+static int i2c_opal_remove(struct platform_device *pdev)
+{
+	struct i2c_adapter *adapter = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(adapter);
+
+	kfree(adapter);
+
+	return 0;
+}
+
+static const struct of_device_id i2c_opal_of_match[] = {
+	{
+		.compatible = "ibm,power8-i2c-port",
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, i2c_opal_of_match);
+
+static struct platform_driver i2c_opal_driver = {
+	.probe	= i2c_opal_probe,
+	.remove	= i2c_opal_remove,
+	.driver	= {
+		.name		= "i2c-opal",
+		.owner		= THIS_MODULE,
+		.of_match_table	= i2c_opal_of_match,
+	},
+};
+
+static int __init i2c_opal_init(void)
+{
+	if (!firmware_has_feature(FW_FEATURE_OPAL))
+		return -ENODEV;
+
+	return platform_driver_register(&i2c_opal_driver);
+}
+
+static void __exit i2c_opal_exit(void)
+{
+	return platform_driver_unregister(&i2c_opal_driver);
+}
+
+MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
+MODULE_DESCRIPTION("IBM OPAL I2C driver");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_opal_init);
+module_exit(i2c_opal_exit);

@@ -153,6 +153,7 @@ struct opal_sg_list {
 #define OPAL_UNREGISTER_DUMP_REGION		102
 #define OPAL_IPMI_SEND				107
 #define OPAL_IPMI_RECV				108
+#define OPAL_I2C_REQUEST			109
 
 #ifndef __ASSEMBLY__
 

@@ -779,6 +780,24 @@ typedef struct oppanel_line {
 	uint64_t 	line_len;
 } oppanel_line_t;
 
+/* OPAL I2C request */
+struct opal_i2c_request {
+	uint8_t	type;
+#define OPAL_I2C_RAW_READ	0
+#define OPAL_I2C_RAW_WRITE	1
+#define OPAL_I2C_SM_READ	2
+#define OPAL_I2C_SM_WRITE	3
+	uint8_t flags;
+#define OPAL_I2C_ADDR_10	0x01	/* Not supported yet */
+	uint8_t	subaddr_sz;		/* Max 4 */
+	uint8_t reserved;
+	__be16 addr;			/* 7 or 10 bit address */
+	__be16 reserved2;
+	__be32 subaddr;		/* Sub-address if any */
+	__be32 size;			/* Data size */
+	__be64 buffer_ra;		/* Buffer real address */
+};
+
 /* /sys/firmware/opal */
 extern struct kobject *opal_kobj;
 

@@ -941,7 +960,8 @@ int64_t opal_ipmi_send(uint64_t interface, struct opal_ipmi_msg *msg,
 		uint64_t msg_len);
 int64_t opal_ipmi_recv(uint64_t interface, struct opal_ipmi_msg *msg,
 		uint64_t *msg_len);
-
+int64_t opal_i2c_request(uint64_t async_token, uint32_t bus_id,
+			 struct opal_i2c_request *oreq);
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
 				   int depth, void *data);

@@ -247,5 +247,6 @@ OPAL_CALL(opal_set_param,			OPAL_SET_PARAM);
 OPAL_CALL(opal_handle_hmi,			OPAL_HANDLE_HMI);
 OPAL_CALL(opal_register_dump_region,		OPAL_REGISTER_DUMP_REGION);
 OPAL_CALL(opal_unregister_dump_region,		OPAL_UNREGISTER_DUMP_REGION);
+OPAL_CALL(opal_i2c_request,			OPAL_I2C_REQUEST);
 OPAL_CALL(opal_ipmi_send,			OPAL_IPMI_SEND);
 OPAL_CALL(opal_ipmi_recv,			OPAL_IPMI_RECV);

@@ -656,6 +656,14 @@ static void opal_console_create_devs(void)
 
 }
 
+static void opal_i2c_create_devs(void)
+{
+	struct device_node *np;
+
+	for_each_compatible_node(np, NULL, "ibm,power8-i2c-port")
+		of_platform_device_create(np, NULL, NULL);
+}
+
 static void opal_request_interrupts(void)
 {
 	const __be32 *irqs;

@@ -721,6 +729,9 @@ static int __init opal_init(void)
 	/* Create console platform devices */
 	opal_console_create_devs();
 
+	/* Create i2c platform devices */
+	opal_i2c_create_devs();
+
 	/* Register OPAL interrupts */
 	opal_request_interrupts();
 

@@ -777,11 +788,6 @@ void opal_shutdown(void)
 	opal_unregister_dump_region(OPAL_DUMP_REGION_LOG_BUF);
 }
 
-/* Export this so that test modules can use it */
-EXPORT_SYMBOL_GPL(opal_invalid_call);
-EXPORT_SYMBOL_GPL(opal_ipmi_send);
-EXPORT_SYMBOL_GPL(opal_ipmi_recv);
-
 /* Convert a region of vmalloc memory to an opal sg list */
 struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
 					     unsigned long vmalloc_size)

@@ -844,3 +850,10 @@ void opal_free_sg_list(struct opal_sg_list *sg)
 			sg = NULL;
 	}
 }
+
+/* Export this so that test modules can use it */
+EXPORT_SYMBOL_GPL(opal_invalid_call);
+EXPORT_SYMBOL_GPL(opal_ipmi_send);
+EXPORT_SYMBOL_GPL(opal_ipmi_recv);
+EXPORT_SYMBOL_GPL(opal_i2c_request);
+

@@ -1021,4 +1021,15 @@ config SCx200_ACB
 	  This support is also available as a module.  If so, the module
 	  will be called scx200_acb.
 
+config I2C_OPAL
+	tristate "IBM OPAL I2C driver"
+	depends on PPC_POWERNV
+	default y
+	help
+	  This exposes the PowerNV platform i2c busses to the linux i2c layer,
+	  the driver is based on the OPAL interfaces.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called as i2c-opal.
+
 endmenu

@@ -100,5 +100,6 @@ obj-$(CONFIG_I2C_ELEKTOR)	+= i2c-elektor.o
 obj-$(CONFIG_I2C_PCA_ISA)	+= i2c-pca-isa.o
 obj-$(CONFIG_I2C_SIBYTE)	+= i2c-sibyte.o
 obj-$(CONFIG_SCx200_ACB)	+= scx200_acb.o
+obj-$(CONFIG_I2C_OPAL)		+= i2c-opal.o
 
 ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG

@@ -0,0 +1,276 @@
+/*
+ * IBM OPAL I2C driver
+ * Copyright (C) 2014 IBM
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/mm.h>
+#include <asm/opal.h>
+#include <asm/firmware.h>
+
+static int i2c_opal_send_request(u32 bus_id, struct opal_i2c_request *req)
+{
+	struct opal_msg msg;
+	int token, rc;
+
+	token = opal_async_get_token_interruptible();
+	if (token < 0) {
+		if (token != -ERESTARTSYS)
+			pr_err("Failed to get the async token\n");
+
+		return token;
+	}
+
+	rc = opal_i2c_request(token, bus_id, req);
+	if (rc != OPAL_ASYNC_COMPLETION) {
+		rc = -EIO;
+		goto exit;
+	}
+
+	rc = opal_async_wait_response(token, &msg);
+	if (rc) {
+		rc = -EIO;
+		goto exit;
+	}
+
+	rc = be64_to_cpu(msg.params[1]);
+	if (rc != OPAL_SUCCESS) {
+		rc = -EIO;
+		goto exit;
+	}
+
+exit:
+	opal_async_release_token(token);
+	return rc;
+}
+
+static int i2c_opal_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
+				int num)
+{
+	unsigned long opal_id = (unsigned long)adap->algo_data;
+	struct opal_i2c_request req;	
+	int rc, i;
+
+	/* We only support fairly simple combinations here of one
+	 * or two messages
+	 */
+	memset(&req, 0, sizeof(req));
+	switch(num) {
+	case 0:
+		return 0;
+	case 1:
+		req.type = (msgs[0].flags & I2C_M_RD) ?
+			OPAL_I2C_RAW_READ : OPAL_I2C_RAW_WRITE;
+		req.addr = cpu_to_be16(msgs[0].addr);
+		req.size = cpu_to_be32(msgs[0].len);
+		req.buffer_ra = cpu_to_be64(__pa(msgs[0].buf));
+		break;
+	case 2:
+		/* For two messages, we basically support only simple
+		 * smbus transactions of a write plus a read. We might
+		 * want to allow also two writes but we'd have to bounce
+		 * the data into a single buffer.
+		 */
+		if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD))
+			return -EIO;
+		if (msgs[0].len > 4)
+			return -EIO;
+		if (msgs[0].addr != msgs[1].addr)
+			return -EIO;
+		req.type = OPAL_I2C_SM_READ;
+		req.addr = cpu_to_be16(msgs[0].addr);
+		req.subaddr_sz = msgs[0].len;
+		for (i = 0; i < msgs[0].len; i++)
+			req.subaddr = (req.subaddr << 8) | msgs[0].buf[i];
+		req.subaddr = cpu_to_be32(req.subaddr);
+		req.size = cpu_to_be32(msgs[1].len);
+		req.buffer_ra = cpu_to_be64(__pa(msgs[1].buf));
+		break;
+	default:
+		return -EIO;
+	}
+
+	rc = i2c_opal_send_request(opal_id, &req);
+	if (rc)
+		return rc;
+
+	return num;
+}
+
+static int i2c_opal_smbus_xfer(struct i2c_adapter *adap, u16 addr,
+			       unsigned short flags, char read_write,
+			       u8 command, int size, union i2c_smbus_data *data)
+{
+	unsigned long opal_id = (unsigned long)adap->algo_data;
+	struct opal_i2c_request req;
+	u8 local[2];
+	int rc;
+
+	memset(&req, 0, sizeof(req));
+
+	req.addr = cpu_to_be16(addr);
+	switch (size) {
+	case I2C_SMBUS_BYTE:
+		req.buffer_ra = cpu_to_be64(__pa(&data->byte));
+		req.size = cpu_to_be32(1);
+		/* Fall through */
+	case I2C_SMBUS_QUICK:
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_RAW_READ : OPAL_I2C_RAW_WRITE;
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		req.buffer_ra = cpu_to_be64(__pa(&data->byte));
+		req.size = cpu_to_be32(1);
+		req.subaddr = cpu_to_be32(command);
+		req.subaddr_sz = 1;
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_SM_READ : OPAL_I2C_SM_WRITE;
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		if (!read_write) {
+			local[0] = data->word & 0xff;
+			local[1] = (data->word >> 8) & 0xff;
+		}
+		req.buffer_ra = cpu_to_be64(__pa(local));
+		req.size = cpu_to_be32(2);
+		req.subaddr = cpu_to_be32(command);
+		req.subaddr_sz = 1;
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_SM_READ : OPAL_I2C_SM_WRITE;
+		break;
+	case I2C_SMBUS_I2C_BLOCK_DATA:
+		req.buffer_ra = cpu_to_be64(__pa(&data->block[1]));
+		req.size = cpu_to_be32(data->block[0]);
+		req.subaddr = cpu_to_be32(command);
+		req.subaddr_sz = 1;
+		req.type = (read_write == I2C_SMBUS_READ) ?
+			OPAL_I2C_SM_READ : OPAL_I2C_SM_WRITE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	rc = i2c_opal_send_request(opal_id, &req);
+	if (!rc && read_write && size == I2C_SMBUS_WORD_DATA) {
+		data->word = ((u16)local[1]) << 8;
+		data->word |= local[0];
+	}
+
+	return rc;
+}
+
+static u32 i2c_opal_func(struct i2c_adapter *adapter)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+	       I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+	       I2C_FUNC_SMBUS_I2C_BLOCK;
+}
+
+static const struct i2c_algorithm i2c_opal_algo = {
+	.master_xfer	= i2c_opal_master_xfer,
+	.smbus_xfer	= i2c_opal_smbus_xfer,
+	.functionality	= i2c_opal_func,
+};
+
+static int i2c_opal_probe(struct platform_device *pdev)
+{
+	struct i2c_adapter	*adapter;
+	const char		*pname;
+	u32			opal_id;
+	int			rc;
+
+	if (!pdev->dev.of_node)
+		return -ENODEV;
+	rc = of_property_read_u32(pdev->dev.of_node, "ibm,opal-id", &opal_id);
+	if (rc) {
+		dev_err(&pdev->dev, "Missing ibm,opal-id property !\n");
+		return -EIO;
+	}
+	adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
+	if (!adapter)
+		return -ENOMEM;
+	adapter->algo = &i2c_opal_algo;
+	adapter->algo_data = (void *)(unsigned long)opal_id;
+	adapter->dev.parent = &pdev->dev;
+	adapter->dev.of_node = of_node_get(pdev->dev.of_node);
+	pname = of_get_property(pdev->dev.of_node, "port-name", NULL);
+	if (pname)
+		strlcpy(adapter->name, pname, sizeof(adapter->name));
+	else
+		strlcpy(adapter->name, "opal", sizeof(adapter->name));
+
+	platform_set_drvdata(pdev, adapter);
+	rc = i2c_add_adapter(adapter);
+	if (rc)
+		dev_err(&pdev->dev, "Failed to register the i2c adapter\n");
+
+	return rc;
+}
+
+static int i2c_opal_remove(struct platform_device *pdev)
+{
+	struct i2c_adapter *adapter = platform_get_drvdata(pdev);
+
+	i2c_del_adapter(adapter);
+
+	kfree(adapter);
+
+	return 0;
+}
+
+static const struct of_device_id i2c_opal_of_match[] = {
+	{
+		.compatible = "ibm,power8-i2c-port",
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, i2c_opal_of_match);
+
+static struct platform_driver i2c_opal_driver = {
+	.probe	= i2c_opal_probe,
+	.remove	= i2c_opal_remove,
+	.driver	= {
+		.name		= "i2c-opal",
+		.owner		= THIS_MODULE,
+		.of_match_table	= i2c_opal_of_match,
+	},
+};
+
+static int __init i2c_opal_init(void)
+{
+	if (!firmware_has_feature(FW_FEATURE_OPAL))
+		return -ENODEV;
+
+	return platform_driver_register(&i2c_opal_driver);
+}
+
+static void __exit i2c_opal_exit(void)
+{
+	return platform_driver_unregister(&i2c_opal_driver);
+}
+
+MODULE_AUTHOR("Neelesh Gupta <neelegup@linux.vnet.ibm.com>");
+MODULE_DESCRIPTION("IBM OPAL I2C driver");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_opal_init);
+module_exit(i2c_opal_exit);